un-understandable

adjective
un-un·​der·​stand·​able | \ ˌən-ˌən-dər-ˈstan-də-bəl How to pronounce un-understandable (audio) \
variants: or ununderstandable

Definition of un-understandable

: impossible to understand : not understandable Karl Jaspers held, famously, that schizophrenic phenomena are ununderstandable.— Naomi Eilan

First Known Use of un-understandable

circa 1631, in the meaning defined above

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The first known use of un-understandable was circa 1631

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